What is the SQL update syntax to update more than one column?

Column Store indexes have evolved significantly over the last few SQL Server versions: The demand for business intelligence (BI) implementations has never been higher; traditional data warehousing is still a popular method for storing information in a non-relational manner.Their usage is limited to data warehousing tables – typically facts and dimensions modeled in a star or snowflake fashion.By compressing the large amount of column data being returned to the BI client, I/O pressure is significantly lessened.In this article I discuss how to use the MERGE statement to UPDATE, INSERT and DELETE records from a target table.Prior to the introduction of SQL Server 2008 if you needed to write logic that inserted rows into a target table if they didn’t exist, or updated them if they did exist you needed a series of “if then else” logic and needed to perform both the UPDATE and INSERT statement.In this article, we will talk about CHECK constraints.We will see how to add CHECK constraints to SQL Server table columns and discuss the pitfalls you may encounter when using this type of SQL Server constraints.